极高烈度地震区不同矢跨比曲线隧道地震响应分析  

Seismic response analysis of curved tunnels with different rise-span ratios in extremely high intensity seismic area

作　　者：张国军[1] 王希宝 肖锋 罗庆斐 王峥峥[1] ZHANG Guojun;WANG Xibao;XIAO Feng;LUO Qingfei;WANG Zhengzheng(School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Sichuan Communication Surveying and Design Institute Co.,Ltd.,Chengdu 610017,China;Sichuan Yakang Expressway Co.,Ltd.,Ya′an 625000,China)

机构地区：[1]大连理工大学建设工程学院,辽宁大连116024 [2]四川省交通勘察设计研究院有限公司,四川成都610017 [3]四川雅康高速公路有限责任公司,四川雅安625000

出　　处：《大连理工大学学报》2025年第3期288-296,共9页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51778109);四川省交通运输科技项目(2019-ZL-12).

摘　　要：依托跑马山隧道极高烈度以及其曲线段平面线形复杂的特点,提出矢跨比(α)的概念对其进行分类,并采用数值模拟方法建立不同矢跨比曲线隧道在地震作用下的数值模型,研究曲线隧道在极高烈度地震区的地震响应.结果表明:与直线隧道相比,曲线隧道在地震作用下的相对变形具有明显区段性,按照变形增长快慢,可以将其分为增长段(0~300 m、900~1200 m)和平稳段(300~900 m).其中增长段相对变形增长快,且x方向水平相对变形(ΔU_(x))较大,而平稳段相对变形几乎不变,但是y方向水平相对变形(ΔU_(y))较大.曲线隧道在增长段的相对变形速率和塑性应变随着矢跨比的增大而增大,其中相对变形速率、塑性应变的最大增长幅度分别达到14倍、3倍,同时平稳段与增长段的加速度差值也增大.综合考虑不同矢跨比曲线隧道相对变形、塑性应变以及加速度响应的变化规律,α=0.1,0.2的曲线隧道的地震响应与直线隧道更为接近,而α=0.3,0.4的曲线隧道的地震响应更具曲线特性,因此在进行抗震设计时需要重点考虑.Based on the extremely high intensity of Paomashan tunnel and the complex plane alignment of its curve sections,the concept of rise-span ratio(α)is put forward to classify it,and the numerical model of curved tunnels with different rise-span ratios under earthquake action is established by numerical simulation method.The seismic response of curved tunnel in extremely high intensity seismic area is studied.The results show that:In comparison to straight tunnels,the curved tunnel exhibits distinct sectional variations in relative deformation under the earthquake action.The curved tunnel can be categorized into a growth section(0-300 m and 900-1200 m)and a stable section(300-900 m)based on the rate of deformation expansion.Notably,the relative deformation in the growth section experiences a rapid increase and higher horizontal relative deformation in x direction(ΔU_(x)).While that in the stable section remains nearly constant,albeit horizontal relative deformation in y direction(ΔU_(y))at a higher magnitude.The relative deformation rate and plastic strain of the curved tunnel in the growth section escalate with an increase in the rise-span ratio.Specifically,the maximum increase amplitudes in relative deformation rate and plastic strain are 14 times and 3 times,respectively.Furthermore,there is an increasing disparity in acceleration between the stable and growth sections.Analyzing the variation patterns of relative deformation,plastic strain and acceleration response for curved tunnels with different rise-span ratios,it is observed that the seismic response of curved tunnels withα=0.1,0.2 is closer to that of straight tunnels,while the seismic response of curved tunnels withα=0.3,0.4 is more curvilinear,necessitating consideration in seismic design.

关 键 词：曲线隧道 极高烈度 矢跨比 地震响应 数值模拟 

分 类 号：U45[建筑科学—桥梁与隧道工程]